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RainBird raster test result flashes "Short MV" & "Open 12"

RainBird raster test result flashes "Short MV" & "Open 12", only see valve wiring on control board up to 11, nothing in slot 12. Q1: is that because MV wire counts as 1, and #11 is 12, or what does it mean; and Q2, where would you begin troubleshooting

Bought house at 10 yrs old, believe sprinkler system was installed shortly after house was built, if that matters re age of system